Improvement in hoisting-machines



UNITE-D STATES PA'IEN'I OFFICE.

. CHARLES H. HERSEY, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN HOISTING-MACHINES.

Specification forming part of Letters Patent No. 14 L05 ll, dated July 22, 1873; application led Juno 19, 1873.

To all whom it may concern.-

Beit known that I, CHARLES H. HERsEY, of Boston, in the county of Sulfolk and State of Massachusetts, have invented an Improvement in Hoisting-Machines; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention suflicient to enable those skilled in the art to practice it.

The invention relates particularly to that class of hoisting-machines in which the winding-drum shaft carries a friction-pulley driven by a friction-pulley on the driving or belt pulley shaft; and my improvement consists in journaling one end of the latter shalt in an eccentric mounted in/ a suitable bearing, so that by turning the eccentric the driving friction-pulley is thrown into or out of contact With the drum friction-pulle:v, and attaching to the eccentric a lever, to which is applied a friction-brake, movement of said lever operating both the brake and the friction drivingwheel7 the movement that throws the brake into operation releasing the friction driver, and the movement that releases said driver bringing the wheels into operative con tact.

The drawing represents a hoisting mechanism embodying my invention.

Figure 1 shows the mechanism in side elevation. Fig. 2 is a sectional elevation through the driving-shaft.

a denotes the winding-drum, xed upon a shaft, b, which is mounted and rotates in suitable journal-boxes d, said shaft having upon one end the friction-pulley e. f denotes the driving-shaft. This shaft bears at one end the belt or driving pulley g, and at its opposite end the friction-pulley h. At one end` the shaft j' is journaled in a rocking bearing, i, and at its opposite end iu an eccentric, lc, said eccentric being mounted in a suitable bearing, l. To a hub, m, extending from thel eccentric, is fixed the llever-,arm n', and by means of this arm the engineer turns the eccentric to throw the friction-pulley l1J into or out of contact with the driving-shaft pulley. To this lever-arm is lixed a brake, o, having such relation to the eccentric (as before set forth) that the movement of the lever toward the wheel e applies the brake to the Wheel, and throws the pulley lh therefrom, as shown by the dotted lines in Fig. 1, While the movement of the lever in the opposite direction throws the brake from the Wheel e, and brings the drivingpulley h into driving contact with said wheel, as seen by the full lines in said Fig. l. Thus, by a single movement of the arm, the brake and driving-pulley are both operated.

In combination with the drum-shaft friction-pulley e, the driving-pulley g, fixed upon a shaft extending through an eccentric, which eccentric is actuated by a lever'arm carrying a brake, the brake o and pulley h being simultaneously actuated by manipulation of the arm, substantially as described.

Executed this 24th day of May, A. D. 1873.

OHAS. H. HERSEY. Witnesses:

FRANCIS GoULD, M. W. FROTHINGHAM. 

